#include<iostream>
using namespace std;

int front()
{
	int i = 0;
	return i++;
}

int back()
{
	int j = 0;
	return ++j;
}
int main()
{
	int ret1 = front();
	cout << "front=" << ret1 << endl;

	int ret2 = back();
	cout << "back=" << ret2 << endl;

	return 0;
}